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import React = require("react");
import axios from "axios";
import { action, computed } from "mobx";
import { observer } from "mobx-react";
import Waveform from "react-audio-waveform";
import { Doc } from "../../fields/Doc";
import { List } from "../../fields/List";
import { listSpec } from "../../fields/Schema";
import { Cast, NumCast } from "../../fields/Types";
import { numberRange } from "../../Utils";
import "./AudioWaveform.scss";
import { Colors } from "./global/globalEnums";
export interface AudioWaveformProps {
duration: number;
mediaPath: string;
layoutDoc: Doc;
trimming: boolean;
PanelHeight: () => number;
}
@observer
export class AudioWaveform extends React.Component<AudioWaveformProps> {
public static NUMBER_OF_BUCKETS = 100;
@computed get _waveHeight() {
return Math.max(50, this.props.PanelHeight());
}
componentDidMount() {
const audioBuckets = Cast(
this.props.layoutDoc.audioBuckets,
listSpec("number"),
[]
);
if (!audioBuckets.length) {
this.props.layoutDoc.audioBuckets = new List<number>([0, 0]); /// "lock" to prevent other views from computing the same data
setTimeout(this.createWaveformBuckets);
}
}
// decodes the audio file into peaks for generating the waveform
createWaveformBuckets = async () => {
axios({ url: this.props.mediaPath, responseType: "arraybuffer" }).then(
(response) => {
const context = new window.AudioContext();
context.decodeAudioData(
response.data,
action((buffer) => {
const decodedAudioData = buffer.getChannelData(0);
const bucketDataSize = Math.floor(
decodedAudioData.length / AudioWaveform.NUMBER_OF_BUCKETS
);
const brange = Array.from(Array(bucketDataSize));
this.props.layoutDoc.audioBuckets = new List<number>(
numberRange(AudioWaveform.NUMBER_OF_BUCKETS).map(
(i: number) =>
brange.reduce(
(p, x, j) =>
Math.abs(
Math.max(p, decodedAudioData[i * bucketDataSize + j])
),
0
) / 2
)
);
})
);
}
);
}
@action
createTrimBuckets = () => {
const audioBuckets = Cast(
this.props.layoutDoc.audioBuckets,
listSpec("number"),
[]
);
const start = Math.floor(
(NumCast(this.props.layoutDoc.clipStart) / this.props.duration) * 100
);
const end = Math.floor(
(NumCast(this.props.layoutDoc.clipEnd) / this.props.duration) * 100
);
return audioBuckets.slice(start, end);
}
render() {
const audioBuckets = Cast(
this.props.layoutDoc.audioBuckets,
listSpec("number"),
[]
);
return (
<div className="audioWaveform">
{this.props.trimming || !this.props.layoutDoc.clipEnd ? (
<Waveform
color={Colors.MEDIUM_BLUE}
height={this._waveHeight}
barWidth={0.1}
pos={this.props.duration}
duration={this.props.duration}
peaks={
audioBuckets.length === AudioWaveform.NUMBER_OF_BUCKETS
? audioBuckets
: undefined
}
progressColor={Colors.MEDIUM_BLUE}
/>
) : (
<Waveform
color={Colors.MEDIUM_BLUE}
height={this._waveHeight}
barWidth={0.1}
pos={this.props.duration}
duration={this.props.duration}
peaks={this.createTrimBuckets()}
progressColor={Colors.MEDIUM_BLUE}
/>
)}
</div>
);
}
}
|
